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BORROWED FUNDS - Senior Notes (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2021
Dec. 31, 2024
Debt Instrument [Line Items]            
Senior notes, net $ 14,952,000   $ 14,952,000     $ 14,899,000
Senior Notes with an aggregate par value of $15,000,000; bearing interest at 2.75% with an effective interest rate of 3.23%; maturing in June 2026            
Debt Instrument [Line Items]            
Aggregate par value $ 15,000,000   $ 15,000,000   $ 15,000,000 $ 15,000,000
Stated interest rate 2.75%   2.75%   2.75% 2.75%
Debt issuance costs         $ 337,000  
Senior notes, net $ 14,952,000   $ 14,952,000   $ 14,663,000 $ 14,899,000
Amortization of debt issuance costs $ 18,000 $ 17,000 $ 53,000 $ 51,000    
Effective interest rate 3.23%   3.23%     3.23%